#!/bin/awk -f# scripts/options.awk - library build configuration control## last changed in libpng version 1.6.11 - June 5, 2014## Copyright (c) 1998-2014 Glenn Randers-Pehrson## This code is released under the libpng license.# For conditions of distribution and use, see the disclaimer# and license in png.h # The output of this script is written to the file given by# the variable 'out'. The script is run twice, once with# an intermediate output file, 'options.tmp' then again on# that file to produce the final output:## awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2# awk -f scripts/options.awk out=options.dfn options.tmp 1>&2## Some options may be specified on the command line:## deb=1 Causes debugging to be output# logunsupported=1 Causes all options to be recorded in the output# everything=off Causes all options to be disabled by default# everything=on Causes all options to be enabled by default## If awk fails on your platform, try nawk instead.## These options may also be specified in the original input file (and# are copied to the preprocessed file). BEGIN{ out="" # intermediate, preprocessed, file pre=-1 # preprocess (first line) version="libpng version unknown" # version information version_file="" # where to find the version err=0 # in-line exit sets this # The following definitions prevent the C preprocessor noticing the lines # that will be in the final output file. Some C preprocessors tokenise # the lines, for example by inserting spaces around operators, and all # C preprocessors notice lines that start with '#', most remove comments. # The technique adopted here is to make the final output lines into # C strings (enclosed in double quotes), preceded by PNG_DFN. As a # consequence the output cannot contain a 'raw' double quote - instead put # @' in, this will be replaced by a single " afterward. See the parser # script dfn.awk for more capabilities (not required here). Note that if # you need a " in a 'setting' in pnglibconf.dfa it must also be @'! dq="@'" # For a single double quote start=" PNG_DFN \"" # Start stuff to output (can't contain a "!) end="\" " # End stuff to output subs="@\" " # Substitute start (substitute a C macro) sube=" \"@" # Substitute end comment=start "/*" # Comment start cend="*/" end # Comment end def=start "#define PNG_" # Arbitrary define sup="_SUPPORTED" end # end supported option und=comment "#undef PNG_" # Unsupported option une="_SUPPORTED" cend # end unsupported option error=start "ERROR:" # error message, terminate with 'end' # Variables deb=0 # debug - set on command line everything="" # do not override defaults logunsupported=0 # write unsupported options too # Precreate arrays # for each option: option[""] = "" # list of all options: default enabled/disabled done[""] = 1 # marks option as having been output requires[""] = "" # requires by option iffs[""] = "" # if by option enabledby[""] = "" # options that enable it by option sets[""] = "" # settings set by each option setval[""] = "" # value to set (indexed: 'option sets[option]') # for each setting: setting[""] = "" # requires by setting defaults[""] = "" # used for a defaulted value doneset[""] = 1 # marks setting as having been output r[""] = "" # Temporary array # For decorating the output file protect = ""} # The output file must be specified before any input:out == "" { print "out=output.file must be given on the command line" err = 1 exit 1} # The very first line indicates whether we are reading pre-processed# input or not, this must come *first* because 'PREPROCESSED' needs# to be the very first line in the temporary file.pre == -1{ if ($0 == "PREPROCESSED") { pre = 0 next } else { pre = 1 print "PREPROCESSED" >out # And fall through to continue processing }} # While pre-processing if version is set to "search" look for a version string# in the following file.pre && version == "search" && version_file == ""{ version_file = FILENAME} pre && version == "search" && version_file != FILENAME{ print "version string not found in", version_file err = 1 exit 1} pre && version == "search" && $0 ~ /^ \* libpng version/{ version = substr($0, 4) print "version =", version >out next} pre && FILENAME == version_file{ next} # variable=value# Sets the given variable to the given value (the syntax is fairly# free form, except for deb (you are expected to understand how to# set the debug variable...)## This happens before the check on 'pre' below skips most of the# rest of the actions, so the variable settings happen during# preprocessing but are recorded in the END action too. This# allows them to be set on the command line too.$0 ~ /^[ ]*version[ ]*=/{ sub(/^[ ]*version[ ]*=[ ]*/, "") version = $0 next}$0 ~ /^[ ]*everything[ =]*off[ ]*$/{ everything = "off" next}$0 ~ /^[ ]*everything[ =]*on[ ]*$/{ everything = "on" next}$0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{ logunsupported = 0 next}$0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{ logunsupported = 1 next}$1 == "deb" && $2 == "=" && NF == 3{ deb = $3 next} # Preprocessing - this just copies the input file with lines# that need preprocessing (just chunk at present) expanded# The bare "pre" instead of "pre != 0" crashes under Sunos awkpre && $1 != "chunk"{ print >out next} # The first characters of the line determine how it is processed,# leading spaces are ignored. In general tokens that are not# keywords are the names of options. An option 'name' is# controlled by the definition of the corresponding macros:## PNG_name_SUPPORTED The option is turned on# PNG_NO_name# PNG_NO_name_SUPPORTED If the first macro is not defined# either of these will turn the option off## If none of these macros are defined the option is turned on, unless# the keyword 'off' is given in a line relating to the option. The# keyword 'on' can also be given, but it will be ignored (since it is# the default.)## In the syntax below a 'name' is indicated by "NAME", other macro# values are indicated by "MACRO", as with "NAME" the leading "PNG_"# is omitted, but in this case the "NO_" prefix and the "_SUPPORTED"# suffix are never used.## Each line is introduced by a keyword - the first non-space characters# on the line. A line starting with a '#' is a comment - it is totally# ignored. Keywords are as follows, a NAME, is simply a macro name# without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED. $1 ~ /^#/ || $0 ~ /^[ ]*$/{ next} # com <comment># The whole line is placed in the output file as a comment with# the preceding 'com' removed$1 == "com"{ if (NF > 1) { # sub(/^[ ]*com[ ]*/, "") $1 = "" print comment $0, cend >out } else print start end >out next} # version# Inserts a version comment$1 == "version" && NF == 1{ if (version == "") { print "ERROR: no version string set" err = 1 # prevent END{} running exit 1 } print comment, version, cend >out next} # file output input protect# Informational: the official name of the input file (without# make generated local directories), the official name of the# output file and, if required, a name to use in a protection# macro for the contents.$1 == "file" && NF >= 2{ print comment, $2, cend >out print comment, "Machine generated file: DO NOT EDIT", cend >out if (NF >= 3) print comment, "Derived from:", $3, cend >out protect = $4 if (protect != "") { print start "#ifndef", protect end >out print start "#define", protect end >out } next} # option NAME ( (requires|enables|if) NAME* | on | off | disabled |# sets SETTING VALUE+ )*# # Declares an option 'NAME' and describes its default setting (disabled)# and its relationship to other options. The option is disabled# unless *all* the options listed after 'requires' are set and at# least one of the options listed after 'if' is set. If the# option is set then it turns on all the options listed after 'enables'.## Note that "enables" takes priority over the required/if/disabled/off# setting of the target option.## The definition file may list an option as 'disabled': off by default,# otherwise the option is enabled: on by default. A later (and it must# be later) entry may turn an option on or off explicitly. $1 == "option" && NF >= 2{ opt = $2 sub(/,$/,"",opt) onoff = option[opt] # records current (and the default is "", enabled) key = "" istart = 3 do { if (istart == 1) { # continuation line val = getline if (val != 1) { # error reading it if (val == 0) print "option", opt ": ERROR: missing continuation line" else print "option", opt ": ERROR: error reading continuation line" # This is a hard error err = 1 # prevent END{} running exit 1 } } for (i=istart; i<=NF; ++i) { val=$(i) sub(/,$/,"",val) if (val == "on" || val == "off" || val == "disabled" || val =="enabled") { key = "" if (onoff != val) { # on or off can zap disabled or enabled: if (onoff == "" || (onoff == "disabled" || onoff == "enabled") && (val == "on" || val == "off")) { # It's easy to mis-spell the option when turning it # on or off, so warn about it here: if (onoff == "" && (val == "on" || val == "off")) { print "option", opt ": ERROR: turning unrecognized option", val # For the moment error out - it is safer err = 1 # prevent END{} running exit 1 } onoff = val } else { # Print a message, otherwise the error # below is incomprehensible print "option", opt ": currently", onoff ": attempt to turn", val break } } } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") { key = val } else if (key == "requires") { requires[opt] = requires[opt] " " val } else if (key == "if") { iffs[opt] = iffs[opt] " " val } else if (key == "enables") { enabledby[val] = enabledby[val] " " opt } else if (key == "sets") { sets[opt] = sets[opt] " " val key = "setval" set = val } else if (key == "setval") { setval[opt " " set] = setval[opt " " set] " " val } else break # bad line format } istart = 1 } while (i > NF && $0 ~ /,$/) if (i > NF) { # Set the option, defaulting to 'enabled' if (onoff == "") onoff = "enabled" option[opt] = onoff next } # Else fall through to the error handler} # chunk NAME [requires OPT] [enables LIST] [on|off|disabled]# Expands to the 'option' settings appropriate to the reading and# writing of an ancillary PNG chunk 'NAME':## option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]# option READ_NAME enables NAME LIST# [option READ_NAME off]# option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]# option WRITE_NAME enables NAME LIST# [option WRITE_NAME off] pre != 0 && $1 == "chunk" && NF >= 2{ # 'chunk' is handled on the first pass by writing appropriate # 'option' lines into the intermediate file. opt = $2 sub(/,$/,"",opt) onoff = "" reqread = "" reqwrite = "" enables = "" req = 0 istart = 3 do { if (istart == 1) { # continuation line val = getline if (val != 1) { # error reading it if (val == 0) print "chunk", opt ": ERROR: missing continuation line" else print "chunk", opt ": ERROR: error reading continuation line" # This is a hard error err = 1 # prevent END{} running exit 1 } } # read the keywords/additional OPTS for (i=istart; i<=NF; ++i) { val = $(i) sub(/,$/,"",val) if (val == "on" || val == "off" || val == "disabled") { if (onoff != val) { if (onoff == "") onoff = val else break # on/off conflict } req = 0 } else if (val == "requires") req = 1 else if (val == "enables") req = 2 else if (req == 1){ reqread = reqread " READ_" val reqwrite = reqwrite " WRITE_" val } else if (req == 2) enables = enables " " val else break # bad line: handled below } istart = 1 } while (i > NF && $0 ~ /,$/) if (i > NF) { # Output new 'option' lines to the intermediate file (out) print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out next } # Else hit the error handler below - bad line format!} # setting MACRO ( requires MACRO* )* [ default VALUE ]# Behaves in a similar way to 'option' without looking for NO_ or# _SUPPORTED; the macro is enabled if it is defined so long as all# the 'requires' macros are also defined. The definitions may be# empty, an error will be issued if the 'requires' macros are# *not* defined. If given the 'default' value is used if the# macro is not defined. The default value will be re-tokenised.# (BTW: this is somewhat restrictive, it mainly exists for the# support of non-standard configurations and numeric parameters,# see the uses in scripts/options.dat $1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){ reqs = "" deflt = "" isdef = 0 key = "" for (i=3; i<=NF; ++i) if ($(i) == "requires" || $(i) == "default") { key = $(i) if (key == "default") isdef = 1 } else if (key == "requires") reqs = reqs " " $(i) else if (key == "default") deflt = deflt " " $(i) else break # Format error, handled below setting[$2] = reqs # NOTE: this overwrites a previous value silently if (isdef && deflt == "") deflt = " " # as a flag to force output defaults[$2] = deflt next} # The order of the dependency lines (option, chunk, setting) is irrelevant# - the 'enables', 'requires' and 'if' settings will be used to determine# the correct order in the output and the final values in pnglibconf.h are# not order dependent. 'requires' and 'if' entries take precedence over# 'enables' from other options; if an option requires another option it# won't be set regardless of any options that enable it unless the other# option is also enabled.## Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h## For simplicity cycles in the definitions are regarded as errors,# even if they are not ambiguous.# A given NAME can be specified in as many 'option' lines as required, the# definitions are additive. # For backwards compatibility equivalent macros may be listed thus:## = [NO_]NAME MACRO# Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED# as appropriate.## The definition is injected into the C compiler input when encountered# in the second pass (so all these definitions appear *after* the @# lines!)## 'NAME' is as above, but 'MACRO' is the full text of the equivalent# old, deprecated, macro. $1 == "=" && NF == 3{ print "#ifdef PNG_" $3 >out if ($2 ~ /^NO_/) print "# define PNG_" $2 >out else print "# define PNG_" $2 "_SUPPORTED" >out print "#endif" >out next} # Lines may be injected into the C compiler input by preceding them# with an "@" character. The line is copied with just the leading# @ removed. $1 ~ /^@/{ # sub(/^[ ]*@/, "") $1 = substr($1, 2) print >out next} # Check for unrecognized lines, because of the preprocessing chunk# format errors will be detected on the first pass independent of# any other format errors.{ print "options.awk: bad line (" NR "):", $0Lines 1–500 of 898. Load more
#!/bin/awk -f # scripts/options.awk - library build configuration control # # last changed in libpng version 1.6.11 - June 5, 2014 # # Copyright (c) 1998-2014 Glenn Randers-Pehrson # # This code is released under the libpng license. # For conditions of distribution and use, see the disclaimer # and license in png.h # The output of this script is written to the file given by # the variable 'out'. The script is run twice, once with # an intermediate output file, 'options.tmp' then again on # that file to produce the final output: # # awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2 # awk -f scripts/options.awk out=options.dfn options.tmp 1>&2 # # Some options may be specified on the command line: # # deb=1 Causes debugging to be output # logunsupported=1 Causes all options to be recorded in the output # everything=off Causes all options to be disabled by default # everything=on Causes all options to be enabled by default # # If awk fails on your platform, try nawk instead. # # These options may also be specified in the original input file (and # are copied to the preprocessed file). BEGIN{ out="" # intermediate, preprocessed, file pre=-1 # preprocess (first line) version="libpng version unknown" # version information version_file="" # where to find the version err=0 # in-line exit sets this # The following definitions prevent the C preprocessor noticing the lines # that will be in the final output file. Some C preprocessors tokenise # the lines, for example by inserting spaces around operators, and all # C preprocessors notice lines that start with '#', most remove comments. # The technique adopted here is to make the final output lines into # C strings (enclosed in double quotes), preceded by PNG_DFN. As a # consequence the output cannot contain a 'raw' double quote - instead put # @' in, this will be replaced by a single " afterward. See the parser # script dfn.awk for more capabilities (not required here). Note that if # you need a " in a 'setting' in pnglibconf.dfa it must also be @'! dq="@'" # For a single double quote start=" PNG_DFN \"" # Start stuff to output (can't contain a "!) end="\" " # End stuff to output subs="@\" " # Substitute start (substitute a C macro) sube=" \"@" # Substitute end comment=start "/*" # Comment start cend="*/" end # Comment end def=start "#define PNG_" # Arbitrary define sup="_SUPPORTED" end # end supported option und=comment "#undef PNG_" # Unsupported option une="_SUPPORTED" cend # end unsupported option error=start "ERROR:" # error message, terminate with 'end' # Variables deb=0 # debug - set on command line everything="" # do not override defaults logunsupported=0 # write unsupported options too # Precreate arrays # for each option: option[""] = "" # list of all options: default enabled/disabled done[""] = 1 # marks option as having been output requires[""] = "" # requires by option iffs[""] = "" # if by option enabledby[""] = "" # options that enable it by option sets[""] = "" # settings set by each option setval[""] = "" # value to set (indexed: 'option sets[option]') # for each setting: setting[""] = "" # requires by setting defaults[""] = "" # used for a defaulted value doneset[""] = 1 # marks setting as having been output r[""] = "" # Temporary array # For decorating the output file protect = "" } # The output file must be specified before any input: out == "" { print "out=output.file must be given on the command line" err = 1 exit 1 } # The very first line indicates whether we are reading pre-processed # input or not, this must come *first* because 'PREPROCESSED' needs # to be the very first line in the temporary file. pre == -1{ if ($0 == "PREPROCESSED") { pre = 0 next } else { pre = 1 print "PREPROCESSED" >out # And fall through to continue processing } } # While pre-processing if version is set to "search" look for a version string # in the following file. pre && version == "search" && version_file == ""{ version_file = FILENAME } pre && version == "search" && version_file != FILENAME{ print "version string not found in", version_file err = 1 exit 1 } pre && version == "search" && $0 ~ /^ \* libpng version/{ version = substr($0, 4) print "version =", version >out next } pre && FILENAME == version_file{ next } # variable=value # Sets the given variable to the given value (the syntax is fairly # free form, except for deb (you are expected to understand how to # set the debug variable...) # # This happens before the check on 'pre' below skips most of the # rest of the actions, so the variable settings happen during # preprocessing but are recorded in the END action too. This # allows them to be set on the command line too. $0 ~ /^[ ]*version[ ]*=/{ sub(/^[ ]*version[ ]*=[ ]*/, "") version = $0 next } $0 ~ /^[ ]*everything[ =]*off[ ]*$/{ everything = "off" next } $0 ~ /^[ ]*everything[ =]*on[ ]*$/{ everything = "on" next } $0 ~ /^[ ]*logunsupported[ =]*0[ ]*$/{ logunsupported = 0 next } $0 ~ /^[ ]*logunsupported[ =]*1[ ]*$/{ logunsupported = 1 next } $1 == "deb" && $2 == "=" && NF == 3{ deb = $3 next } # Preprocessing - this just copies the input file with lines # that need preprocessing (just chunk at present) expanded # The bare "pre" instead of "pre != 0" crashes under Sunos awk pre && $1 != "chunk"{ print >out next } # The first characters of the line determine how it is processed, # leading spaces are ignored. In general tokens that are not # keywords are the names of options. An option 'name' is # controlled by the definition of the corresponding macros: # # PNG_name_SUPPORTED The option is turned on # PNG_NO_name # PNG_NO_name_SUPPORTED If the first macro is not defined # either of these will turn the option off # # If none of these macros are defined the option is turned on, unless # the keyword 'off' is given in a line relating to the option. The # keyword 'on' can also be given, but it will be ignored (since it is # the default.) # # In the syntax below a 'name' is indicated by "NAME", other macro # values are indicated by "MACRO", as with "NAME" the leading "PNG_" # is omitted, but in this case the "NO_" prefix and the "_SUPPORTED" # suffix are never used. # # Each line is introduced by a keyword - the first non-space characters # on the line. A line starting with a '#' is a comment - it is totally # ignored. Keywords are as follows, a NAME, is simply a macro name # without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED. $1 ~ /^#/ || $0 ~ /^[ ]*$/{ next } # com <comment> # The whole line is placed in the output file as a comment with # the preceding 'com' removed $1 == "com"{ if (NF > 1) { # sub(/^[ ]*com[ ]*/, "") $1 = "" print comment $0, cend >out } else print start end >out next } # version # Inserts a version comment $1 == "version" && NF == 1{ if (version == "") { print "ERROR: no version string set" err = 1 # prevent END{} running exit 1 } print comment, version, cend >out next } # file output input protect # Informational: the official name of the input file (without # make generated local directories), the official name of the # output file and, if required, a name to use in a protection # macro for the contents. $1 == "file" && NF >= 2{ print comment, $2, cend >out print comment, "Machine generated file: DO NOT EDIT", cend >out if (NF >= 3) print comment, "Derived from:", $3, cend >out protect = $4 if (protect != "") { print start "#ifndef", protect end >out print start "#define", protect end >out } next } # option NAME ( (requires|enables|if) NAME* | on | off | disabled | # sets SETTING VALUE+ )* # # Declares an option 'NAME' and describes its default setting (disabled) # and its relationship to other options. The option is disabled # unless *all* the options listed after 'requires' are set and at # least one of the options listed after 'if' is set. If the # option is set then it turns on all the options listed after 'enables'. # # Note that "enables" takes priority over the required/if/disabled/off # setting of the target option. # # The definition file may list an option as 'disabled': off by default, # otherwise the option is enabled: on by default. A later (and it must # be later) entry may turn an option on or off explicitly. $1 == "option" && NF >= 2{ opt = $2 sub(/,$/,"",opt) onoff = option[opt] # records current (and the default is "", enabled) key = "" istart = 3 do { if (istart == 1) { # continuation line val = getline if (val != 1) { # error reading it if (val == 0) print "option", opt ": ERROR: missing continuation line" else print "option", opt ": ERROR: error reading continuation line" # This is a hard error err = 1 # prevent END{} running exit 1 } } for (i=istart; i<=NF; ++i) { val=$(i) sub(/,$/,"",val) if (val == "on" || val == "off" || val == "disabled" || val =="enabled") { key = "" if (onoff != val) { # on or off can zap disabled or enabled: if (onoff == "" || (onoff == "disabled" || onoff == "enabled") && (val == "on" || val == "off")) { # It's easy to mis-spell the option when turning it # on or off, so warn about it here: if (onoff == "" && (val == "on" || val == "off")) { print "option", opt ": ERROR: turning unrecognized option", val # For the moment error out - it is safer err = 1 # prevent END{} running exit 1 } onoff = val } else { # Print a message, otherwise the error # below is incomprehensible print "option", opt ": currently", onoff ": attempt to turn", val break } } } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") { key = val } else if (key == "requires") { requires[opt] = requires[opt] " " val } else if (key == "if") { iffs[opt] = iffs[opt] " " val } else if (key == "enables") { enabledby[val] = enabledby[val] " " opt } else if (key == "sets") { sets[opt] = sets[opt] " " val key = "setval" set = val } else if (key == "setval") { setval[opt " " set] = setval[opt " " set] " " val } else break # bad line format } istart = 1 } while (i > NF && $0 ~ /,$/) if (i > NF) { # Set the option, defaulting to 'enabled' if (onoff == "") onoff = "enabled" option[opt] = onoff next } # Else fall through to the error handler } # chunk NAME [requires OPT] [enables LIST] [on|off|disabled] # Expands to the 'option' settings appropriate to the reading and # writing of an ancillary PNG chunk 'NAME': # # option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT] # option READ_NAME enables NAME LIST # [option READ_NAME off] # option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT] # option WRITE_NAME enables NAME LIST # [option WRITE_NAME off] pre != 0 && $1 == "chunk" && NF >= 2{ # 'chunk' is handled on the first pass by writing appropriate # 'option' lines into the intermediate file. opt = $2 sub(/,$/,"",opt) onoff = "" reqread = "" reqwrite = "" enables = "" req = 0 istart = 3 do { if (istart == 1) { # continuation line val = getline if (val != 1) { # error reading it if (val == 0) print "chunk", opt ": ERROR: missing continuation line" else print "chunk", opt ": ERROR: error reading continuation line" # This is a hard error err = 1 # prevent END{} running exit 1 } } # read the keywords/additional OPTS for (i=istart; i<=NF; ++i) { val = $(i) sub(/,$/,"",val) if (val == "on" || val == "off" || val == "disabled") { if (onoff != val) { if (onoff == "") onoff = val else break # on/off conflict } req = 0 } else if (val == "requires") req = 1 else if (val == "enables") req = 2 else if (req == 1){ reqread = reqread " READ_" val reqwrite = reqwrite " WRITE_" val } else if (req == 2) enables = enables " " val else break # bad line: handled below } istart = 1 } while (i > NF && $0 ~ /,$/) if (i > NF) { # Output new 'option' lines to the intermediate file (out) print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out next } # Else hit the error handler below - bad line format! } # setting MACRO ( requires MACRO* )* [ default VALUE ] # Behaves in a similar way to 'option' without looking for NO_ or # _SUPPORTED; the macro is enabled if it is defined so long as all # the 'requires' macros are also defined. The definitions may be # empty, an error will be issued if the 'requires' macros are # *not* defined. If given the 'default' value is used if the # macro is not defined. The default value will be re-tokenised. # (BTW: this is somewhat restrictive, it mainly exists for the # support of non-standard configurations and numeric parameters, # see the uses in scripts/options.dat $1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){ reqs = "" deflt = "" isdef = 0 key = "" for (i=3; i<=NF; ++i) if ($(i) == "requires" || $(i) == "default") { key = $(i) if (key == "default") isdef = 1 } else if (key == "requires") reqs = reqs " " $(i) else if (key == "default") deflt = deflt " " $(i) else break # Format error, handled below setting[$2] = reqs # NOTE: this overwrites a previous value silently if (isdef && deflt == "") deflt = " " # as a flag to force output defaults[$2] = deflt next } # The order of the dependency lines (option, chunk, setting) is irrelevant # - the 'enables', 'requires' and 'if' settings will be used to determine # the correct order in the output and the final values in pnglibconf.h are # not order dependent. 'requires' and 'if' entries take precedence over # 'enables' from other options; if an option requires another option it # won't be set regardless of any options that enable it unless the other # option is also enabled. # # Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h # # For simplicity cycles in the definitions are regarded as errors, # even if they are not ambiguous. # A given NAME can be specified in as many 'option' lines as required, the # definitions are additive. # For backwards compatibility equivalent macros may be listed thus: # # = [NO_]NAME MACRO # Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED # as appropriate. # # The definition is injected into the C compiler input when encountered # in the second pass (so all these definitions appear *after* the @ # lines!) # # 'NAME' is as above, but 'MACRO' is the full text of the equivalent # old, deprecated, macro. $1 == "=" && NF == 3{ print "#ifdef PNG_" $3 >out if ($2 ~ /^NO_/) print "# define PNG_" $2 >out else print "# define PNG_" $2 "_SUPPORTED" >out print "#endif" >out next } # Lines may be injected into the C compiler input by preceding them # with an "@" character. The line is copied with just the leading # @ removed. $1 ~ /^@/{ # sub(/^[ ]*@/, "") $1 = substr($1, 2) print >out next } # Check for unrecognized lines, because of the preprocessing chunk # format errors will be detected on the first pass independent of # any other format errors. { print "options.awk: bad line (" NR "):", $0